Insulator-mold.



C. C. JOHNSON. INSULATOR MOLD.

APPLICATION PILBD SEPT. 14, 190e.

Patented Feb.23,19o`9.

C. C. JOHNSON.

INSULATOR MOLD. APPLICATION FILED sEPT.14, 1908.

I 913,212. Patented Feb. 23, 1909. P j 2 SHEETS-SHEET 2.

QT" /j 5 ./f -/J @ma ntoz Sie.,

UNITED STATES PATENT OFFTCE.

CHAUNCEY C. JOHNSON, OF SCRANTON, PENNSYLVANIA, ASSIGNOR OF NINE-TWENTIETHS TO JOHN A.y WATSON, OF PITTSTON, PENNSYLVANIA.

INSULATOR-VIOLD Specification of Letters Patent.

Patented Feb. 23, 1909.

Application filed. September 14, 1908. Serial No. 453,032.

T o all whom it may concern:

Be it known that I, CHAUNGEY C. JOHN- soN, afcitizen of the United States, residing at Scranton, in the county of Lackawanna and State of Pennsylvania, have invented a new and useful Insulator-Hold, of which the following is a specification.

This invention relates to molding apparatus and more particularly to means for shaping the interior or threaded portions of insulators of the pony and petticoat types.

The object of the invention is to provide a collapsible core operating in connection with a plunger and whereby the threaded portions of the core will automatically shift out of engagement with the molded threads and be withdrawn from the insulator during the movement of the apparatus in one direction, the reversal of said apparatus serving to return the parts of the core to their initial positions.

A still further `object is to provide a core which can be used in connection with a reciprocating element so as to automatically move into the flask, collapse therein and withdraw therefrom without requiring the attention of an operator.

Vith these and other objects in view the invention consists of certain novel details of construction and combinations of parts hereinafter more fully described and pointed out in the claims.

In the accompanying drawings, the preferred form of the invention has been shown.

In said drawings Figure l is a longitudinal section through the apparatus and showing the core in extended position within an insu ator. Fig. 2 is a similar view showing theirst position of the core during the withdrawal thereof from the molded insulator, said core being shown collapsed or contracted so as to clear the threads formed within the insulator. Fig. 3 is a similar view showing the core withdrawn from the insulator and at the limits of its movement in one direction, the position of the core at an intermediate point being indicated by dotted lines. Fig. 4 is an elevation of the core and plunger but showing the guide housing in section, the parts being shown in the positions assumed by them during the forward movement. Fig. 5 is a section on the line A--B of Fig. 2. Fig. 6 is a detail view of one of the members of the core. Fig. 7 is a perspective view of the inner face of one of the guide members.

Referring to the figures by characters of reference l, l designates the oppositely disposed similar guide members secured together in any preferred manner and having longitudinal semi-cylindrical grooves in their inner or adjoining faces which cooperate to form a cylindrical passage 2. Formed within the wall of this passage at diametrically opposite points are longitudinal grooves 3 3 each of which gradually increases in depth from one end of the passage 2 to a point between the ends thereof, the inner end wall of each groove being abruptly inclined as indicated at 1i.

A plunger 5 is mounted to reciprocate within the passage 2 and is provided at one end with oppositely disposed longitudinally extending grooves 6 separated by a central longitudinal web 7. This web terminates between the ends of the groove 6 and is enlarged at its outer end to form shoulders 8 one of which is located within each of the grooves 6. The grooves 6 are of the same width as the grooves 3 and are designed to register therewith when the plunger 5 is retracted a predetermined distance. A flat elongated spacing or spreading tongue 9 extends longitudinally from the outer end of the web 7 and in alinement with the longitudinal center of said web. This tongue projects beyond the ends of grooves 6 and those portions of the plunger extending beyond the web 7 are reduced and rounded as indicated at 10 for the purpose hereinafter set forth.

The collapsible portion of the core consists of two oppositely disposed similar strips 11. Each of the strips is designed to fit loosely within one of the grooves 6 and has a leaf spring l2 secured to its inner face at one end while its other end is rounded and bears upon the adjoining face of the web 7, thus serving to hold the outer face of the strip 1l constantly in contact with the wall of the passage formed by the grooves 2 and with the wall of the groove 3. An elongated recess 13 is also formed in the inner face of each strip 1l and projecting into this recess is the adjoining shoulder or enlargement 8 of the web. A shoulder 14 is formed at one end of the recess 13 and this shoulder and the'shoulderS are designed 'to cooperate for fthe -purpose 'of limiting "the movement of the strips 11 outwardly relatively to the .plunger v 5. The .outer :ends of the two members l1. converge asl indicated at l5, the inner or adjoining faces of the converging portions being rounded fand designed to rest upon the opposite faces of the tongue 9 or to rest in the path -of'1said tongue as shown in Figs. l and 2 respectively. The outer faces of the outer ends of these members ll are rounded as indicated at '16 so asto conform'witli the Vcontour'of the corresponding rounded portion lO'of the plunger 5, and those portions ofthe members extending beyond these rounded portions are screw threaded Aas indicated at 17 so thatV when said threaded portions are positioned Vupon opposite sides' of the'tongue 9, as shown VVin Fig. l, a vtapered screwthreaded coreis formed, Vthe threads being intersected by the edge portions of the tongue. The rounded portions 16 and 1G of the strips ll -and'of the plunger serve to produce the flared open end portion of the insulator.

in using the apparatus herein described the material to be shaped is placed within a flask and the plunger moved forward from the position indicated in full lines in Fig. 3. When' the parts are thus positioned vthe rear or inner ends `of the members 11 are held firmly in contact with opposite portions of the wa-ll of 'thepassage 2 by the springs 12 andas the plunger is .moved longitudinally the web 7 will travel between the members 1l and tongue-9 will assume a'po'sition between thethreaded -terminal portions 7 of said vmembers l1. In other words the spring pressed members will remain stationary by reason of their frictional engagement with the guide l until the plunger 5 has moved a suficient distance to vbring the end walls of the grooves 6 into contact with the inner ends of the members 11. Further longitudinal movement of the plunger will'force the members l1 longitudinally from the guide l so .as to project the threaded portions 17 and the tongue 9 into the material contained within the flask. The parts will thus assume the position indicate-d in Fig. l, the molded insulator being designated by the letter A. As soon as the molding has been effected the plunger is moved in the opposite direction and inasmuch as the threads 17 engage the threads molded within the insulator it will be apparentthat during' the first part of the return movement of the plunger the members 1l willbeheld against movement until the tongue 9 is withdrawn from the insulator. As soon as this operation is effected the spring l2 will press the inner ends of the members l1 inopposite directions and into thegrooves 3,'the-shoulders l14 'rocking upon-the web 7. The threaded ends 17 will' thus-be drawn together and out of'engagement with the molded threads so "that as soon as Ythe -plunger 5 has been moved a. sufficient distance vto bring the shoulders 8 into Contact with the shoulders v14,-the'members ll will also be shifted longitudinally so as to withdraw the contracted `threaded portion of the core :from the .molded .insulator A. During this movement the inner ends. of the members 1i travel within. thel grooves 3 until .they .strike the inclined walls il, which walls then operate to deflect the ends of the membersll inwardly so as to permit the parts to as- Vvsume theposition indicated in FigJS.

yThe operation hereinbefore described can Vthen lbe repeated.

it will be seen that a mold such as herein described is particularly vadapted for shaping vinterior ,threads and while especially used for Vforming insulators it can, obviously,

also'be employed for shaping the interior faces of other objects. It will be 5seenthat vthe mechanism requires little attention inasmuch as all of the movements thereof .are

'produced automatically and if desired .a

large'number of plungers can .be connected so as to operate simultaneously ina single machine. i

Various changes may be made of the construction and arrangement of the .parts without departing from the spirit or sacrificing any advantages of the invention.

`hat is claimed is -In molding apparatus the combination with a guide; of a plunger mounted to reciprocate therein, .strips tiltably mounted upon the plunger and within the guide,.said

plunger and strips having coperating means .fortransmitting motion to the strips from and Ywithin the guide, means integralwith u the Vstrips and plunger and coperating to transmitlongitudinal movement to the strips fromV the plunger during theqlast portions only of fthe movement of the plunger in either` direction, yield-ing means for holding the outer endsof the strips normally in contact, and means upon theL plunger for shifting saidv endsapart during the movement of the plunger in one direction, said ends being screw-threaded.

' InV moldingv apparatusjthe combination with a guide; of a plunger mounted to reciprocate therein, strips tiltably and slidably mounted at intermediate points upon the plunger and Within the guide, means interposed between the inner ends of the strips and the plunger for holding the outer ends of said strips normally in contact, said outer ends being screw-threaded, and means upon the plunger and movable between the outer ends to spread them apart, there being integral coperating means upon the strips and plunger for transmitting motion to the strips from the plunger during the last portions of the movement of the plunger in either direction.

et. In molding apparatus the combination with a guide having oppositely disposed interior grooves, and a plunger mounted Within the guide, having oppositely disposed longitudinal grooves; of core sections slidably mounted Within the grooves in the plunger and projecting beyond one end of said grooves, yielding means for automatically projecting t-he inner end of the sections into the interior grooves in the guide and to shift the outer ends of the sections into contact, and separate means carried by the plunger for shifting the sections into the grooves Within the guide when the plunger is moved in one direction and for spreading apart the contacting ends of the sections when the plunger is moved in the opposite direction.

5. In molding apparatus the combination with a guide having longitudinal interior grooves, and a plunger mounted Within the guides having oppositely disposed longitudinal grooves and a spacing tongue projecting beyond the grooves, there being a stop shoulder within each groove; of oppositely disposed core sections slidably mounted Within the grooves, each section having a shoulder cooperating with the shoulders in the grooves, the sections being movably mounted at one end Within the guide, elastic means for holding said inner ends of the core sections normally pressed against the Wall of the guide or against the Wall of the interior grooves therein, the outer ends of the core sections being disposed to contact when the inner ends of said. sections are positioned in the guide grooves, said contacting ends being disposed in the path of, and disposed to be shifted by the tongue.

n testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two Witnesses.

CHAUNCEY C. JOHNSON.

Witnesses JAS. M. WALKER, J. Ross CoLHoUN. 

